<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div>
        <a href="base.html" target="myframe">跳转base.html</a>
        <a href="1.html" target="myframe">跳转1.html</a>
        <a href="img/2.html" target="myframe">跳转2.html</a>
        <a href="../3.html" target="myframe">跳转3.html</a>
    </div>
    <iframe name="myframe" width="1000" height="500"></iframe>

</body>
</html>